What a ******* on prepaid data

Telkom is such a ripoff, 100 mgb flies within seconds of logging into Facebook. 1 gb lasts only a few minutes. I use vodacom mostly because their data lasts for long. Icasa must look into Telkom's billing system. It does not help for them to charge low when we purchase data but when we utilize it we have to spend more because you have to buy data everytime you try to connect to the internet as the one you have gets depleted within a matter of minutes. We are being **********.